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公开(公告)号：US2146301A
公开(公告)日：1939-02-07
申请号：US10252436
申请日：1936-09-25
Applicant: RCA CORP
Inventor： KNOTTS WARREN L , BEVERAGE HAROLD H
IPC: H04B7/155
CPC classification number: H04B7/15528 , H04B7/155
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